服役期间T91/TP347H异种钢接头TP347H钢侧热影响区沿晶开裂分析
Intergranular Cracking Analysis in Heat-Affected Zone on TP347H Steel Side of T91/TP347H Dissimilar Steel Joint in Service
摘 要
某电厂锅炉屏式过热器在运行8万h后，其T91/TP347H异种钢接头出现沿晶裂纹，裂纹位于TP347H奥氏体钢侧热影响区。通过显微组织观察、硬度测试和拉伸试验分析了沿晶开裂的特征、形成原因及其对力学性能的影响。结果表明：沿晶裂纹出现在TP347H钢侧熔合线处，为晶间腐蚀裂纹，裂纹深3~4个晶粒尺度，内部有氧化物填充；存在沿晶裂纹的屏式过热器管接头的硬度和抗拉强度符合标准要求，但塑性较差；粗大的晶粒和焊后较快的冷速使得屏式过热器管接头TP347H钢侧热影响区在高温服役过程中易发生晶界贫铬，引发晶间腐蚀，TP347H钢侧熔合线附近较高的硬度梯度导致应力易在此处集中，从而加速晶间腐蚀裂纹的产生。
沿晶裂纹
晶间腐蚀
T91/TP347H dissimilar steel joint
intergranular crack
intergranular corrosion
Abstract
Intergranular cracks were found in T91/TP347H dissimilar steel joint of a boiler panel superheater in a power plant after 80 000 h operation. The cracks were located in the heat-affected zone on TP347H austenitic steel side. The features and forming causes of the intergranular cracking and its effect on the mechanical properties were analyzed by microstructure observation, hardness test and tensile test. The results show that the intergranular cracks existed at the fusion line on TP347H steel side, and were intergranular corrosion cracks. The cracks penetrated through 3-4 grains and were filled with oxides inside. The hardness and tensile strength of the panel superheater tube joint with intergranular cracks met the requirements, but the plasticity was poor. Coarse grains and fast cooling rates after welding made the heat affected zone on the TP347H steel side of the panel superheater tube joint prone to forming depletion of chromium at grain boundaries during high-temperature service, causing intergranular corrosion. The high hardness gradient near the fusion line on the TP347H steel side led to stress concentration here, accelerating the generation of intergranular corrosion cracks.
中图分类号 TG47 DOI 10.11973/jxgccl202207015
所属栏目 材料性能及应用
基金项目
收稿日期 2021/4/12
修改稿日期 2022/5/25
网络出版日期
作者单位点击查看
备注李勇(1991-),男,湖北黄冈人,工程师,博士
引用该论文: LI Yong. Intergranular Cracking Analysis in Heat-Affected Zone on TP347H Steel Side of T91/TP347H Dissimilar Steel Joint in Service[J]. Materials for mechancial engineering, 2022, 46(7): 82～89
李勇. 服役期间T91/TP347H异种钢接头TP347H钢侧热影响区沿晶开裂分析[J]. 机械工程材料, 2022, 46(7): 82～89
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参考文献
【1】陈鑫,蔡文河,张坤,等.火电厂异种钢焊接接头早期失效研究现状[J].焊接,2018(2):19-25. CHEN X,CAI W H,ZHANG K,et al.Overview of early failure of dissimilar steels joint in power plants[J].Welding & Joining,2018(2):19-25.
【2】李克俭,张宇,蔡志鹏.异种金属焊接接头在热-力耦合作用下的断裂位置转移机理[J].金属学报,2020,56(11):1463-1473. LI K J,ZHANG Y,CAI Z P.Fracture location shift of dissimilar metal welds under coupled thermal-stress effect[J].Acta Metallurgica Sinica,2020,56(11):1463-1473.
【3】杨义,李万岭,方立忠.电站异种钢接头失效原因分析研究[C]//全国火电100~200 MW级机组技术协作会2008年年会论文集.秦皇岛:全国发电机组技术协作会,2008:3. YANG Y,LI W L,FANG L Z.Study analysis on failure reason of dissimilar steel joint in power station[C]//Proceedings of Annual Meeting in 2008 of China Thermal Power 100-200 MW Unit Technical Cooperation. Qinhuangdao:National Technical Collaboration of Power Plant Generation,2008:3.
【4】石仁强,王舒涛,杨超,等.超超临界机组M/F-A异种钢焊接接头熔合线断裂分析[J].焊接技术,2020,49(增刊1):173-177. SHI R Q,WANG S T,YANG C,et al.Fracture analysis at fusion line of M/F-A dissimilar steel welded joints[J].Welding Technology,2020,49(S1):173-177.
【5】刘课秀,封小亮,马括,等.某电站锅炉末级再热器异种钢管焊接接头的断裂原因[J].机械工程材料,2020,44(1):83-86. LIU K X,FENG X L,MA K,et al.Fracture cause of dissimilar steel tube welded joint of final boiler reheater in a power plant[J].Materials for Mechanical Engineering,2020,44(1):83-86.
【6】蔡志强,林雪松,邓永龙,等.高温再热器Super304H与T91异种钢接头开裂失效分析[J].四川电力技术,2016,39(2):88-90. CAI Z Q,LIN X S,DENG Y L,et al.Failure analysis for cracking of Super304H and T91 dissimilar steels welded joint of high-temperature reheater[J].Sichuan Electric Power Technology,2016,39(2):88-90.
【7】刘军.某超超临界直流锅炉高温再热器异种钢焊接接头开裂原因分析[J].理化检验(物理分册),2018,54(2):141-144. LIU J.Cause analysis on cracking of dissimilar steel welded joints used on high temperature reheater of an ultra-supercritical concurrent boiler[J].Physical Testing and Chemical Analysis (Part A:Physical Testing),2018,54(2):141-144.
【8】张宗来.电站锅炉12Cr1MoVG/TP347H异种钢接头断裂分析[J].热力发电,2017,46(5):132-136. ZHANG Z L.Fracture analysis for dissimilar metal welded joints of 12Cr1MoVG/TP347H in a utility boiler[J].Thermal Power Generation,2017,46(5):132-136.
【9】张坤,蔡文河,王智春,等.T91/TP347H异种钢焊接接头性能分析[J].华北电力技术,2016(8):34-41. ZHANG K,CAI W H,WANG Z C,et al.Performance analysis of the T91/TP347H dissimilar steel welded joints[J].North China Electric Power,2016(8):34-41.
【10】孙伟,葛萍,秦萍丽.SA-213T91+SA-213TP347H异种钢接头失效分析[J].锅炉制造,2015(2):27-29. SUN W,GE P,QIN P L.Failure analysis on welded joints of SA-213T91 and SA-213TP347H dissimilar steel[J].Boiler Manufacturing,2015(2):27-29.
【11】王淦刚,刘天佐,尚建路,等.T91/TP347HFG异种钢焊接接头裂纹原因分析[J].失效分析与预防,2015,10(1):51-56. WANG G G,LIU T Z,SHANG J L,et al.Crack analysis of T91/TP347HFG dissimilar steel welding joint[J].Failure Analysis and Prevention,2015,10(1):51-56.
【12】耿波,张路,范念青,等.水蒸气温度和流量对T91钢氧化行为的影响[J].材料工程,2014,42(1):52-57. GENG B,ZHANG L,FAN N Q,et al.Effect of water vapor temperature and flow on oxidation behavior of T91 heat resisting steel[J].Journal of Materials Engineering,2014,42(1):52-57.
【13】高巍,金耀华,王正品,等.高温空气介质下T91钢氧化动力学研究[J].热加工工艺,2007,36(20):10-12. GAO W,JIN Y H,WANG Z P,et al.Research on oxidation kinetics of T91 steel under high-temperature air medium[J].Hot Working Technology,2007,36(20):10-12.
【14】郭丹,张维科,彭章华,等.马氏体钢T91和奥氏体钢TP347H管材高温蒸汽氧化层特性研究[J].腐蚀科学与防护技术,2019,31(6):609-614. GUO D,ZHANG W K,PENG Z H,et al.Characteristics of oxide scales formed on T91 martensite steel and TP347H austenite steel in high temperature steam[J].Corrosion Science and Protection Technology,2019,31(6):609-614.
【15】赵彦芬,周江,赵林松,等.TP304H/SA213T22异种钢焊口的状态检测与寿命评估[J].热力发电,2005,34(10):72-75. ZHAO Y F,ZHOU J,ZHAO L S,et al.Status inspection and service life assessment of welded joints betweed TP304H/SA213T22 steels of different sort[J].Thermal Power Generation,2005,34(10):72-75.
【16】VIITALA H,GALFI I,TASKINEN P.Initial oxidation behaviour of niobium stabilized TP347H austenitic stainless steel-Effect of grain size and temperature[J].Materials and Corrosion,2015,66(9):851-862.
【17】王玮,杨钢,赵吉庆,等.晶粒尺寸对Cr-Ni奥氏体不锈钢在硝酸中晶间腐蚀敏感性的影响[J].钢铁研究学报,2010,22(1):18-21. WANG W,YANG G,ZHAO J Q,et al.Influence of grain size on susceptibility of Cr-Ni austenitic stainless steel to intergranular attack in nitric acid[J].Journal of Iron and Steel Research,2010,22(1):18-21.
【2】李克俭,张宇,蔡志鹏.异种金属焊接接头在热-力耦合作用下的断裂位置转移机理[J].金属学报,2020,56(11):1463-1473. LI K J,ZHANG Y,CAI Z P.Fracture location shift of dissimilar metal welds under coupled thermal-stress effect[J].Acta Metallurgica Sinica,2020,56(11):1463-1473.
【3】杨义,李万岭,方立忠.电站异种钢接头失效原因分析研究[C]//全国火电100~200 MW级机组技术协作会2008年年会论文集.秦皇岛:全国发电机组技术协作会,2008:3. YANG Y,LI W L,FANG L Z.Study analysis on failure reason of dissimilar steel joint in power station[C]//Proceedings of Annual Meeting in 2008 of China Thermal Power 100-200 MW Unit Technical Cooperation. Qinhuangdao:National Technical Collaboration of Power Plant Generation,2008:3.
【4】石仁强,王舒涛,杨超,等.超超临界机组M/F-A异种钢焊接接头熔合线断裂分析[J].焊接技术,2020,49(增刊1):173-177. SHI R Q,WANG S T,YANG C,et al.Fracture analysis at fusion line of M/F-A dissimilar steel welded joints[J].Welding Technology,2020,49(S1):173-177.
【5】刘课秀,封小亮,马括,等.某电站锅炉末级再热器异种钢管焊接接头的断裂原因[J].机械工程材料,2020,44(1):83-86. LIU K X,FENG X L,MA K,et al.Fracture cause of dissimilar steel tube welded joint of final boiler reheater in a power plant[J].Materials for Mechanical Engineering,2020,44(1):83-86.
【6】蔡志强,林雪松,邓永龙,等.高温再热器Super304H与T91异种钢接头开裂失效分析[J].四川电力技术,2016,39(2):88-90. CAI Z Q,LIN X S,DENG Y L,et al.Failure analysis for cracking of Super304H and T91 dissimilar steels welded joint of high-temperature reheater[J].Sichuan Electric Power Technology,2016,39(2):88-90.
【7】刘军.某超超临界直流锅炉高温再热器异种钢焊接接头开裂原因分析[J].理化检验(物理分册),2018,54(2):141-144. LIU J.Cause analysis on cracking of dissimilar steel welded joints used on high temperature reheater of an ultra-supercritical concurrent boiler[J].Physical Testing and Chemical Analysis (Part A:Physical Testing),2018,54(2):141-144.
【8】张宗来.电站锅炉12Cr1MoVG/TP347H异种钢接头断裂分析[J].热力发电,2017,46(5):132-136. ZHANG Z L.Fracture analysis for dissimilar metal welded joints of 12Cr1MoVG/TP347H in a utility boiler[J].Thermal Power Generation,2017,46(5):132-136.
【9】张坤,蔡文河,王智春,等.T91/TP347H异种钢焊接接头性能分析[J].华北电力技术,2016(8):34-41. ZHANG K,CAI W H,WANG Z C,et al.Performance analysis of the T91/TP347H dissimilar steel welded joints[J].North China Electric Power,2016(8):34-41.
【10】孙伟,葛萍,秦萍丽.SA-213T91+SA-213TP347H异种钢接头失效分析[J].锅炉制造,2015(2):27-29. SUN W,GE P,QIN P L.Failure analysis on welded joints of SA-213T91 and SA-213TP347H dissimilar steel[J].Boiler Manufacturing,2015(2):27-29.
【11】王淦刚,刘天佐,尚建路,等.T91/TP347HFG异种钢焊接接头裂纹原因分析[J].失效分析与预防,2015,10(1):51-56. WANG G G,LIU T Z,SHANG J L,et al.Crack analysis of T91/TP347HFG dissimilar steel welding joint[J].Failure Analysis and Prevention,2015,10(1):51-56.
【12】耿波,张路,范念青,等.水蒸气温度和流量对T91钢氧化行为的影响[J].材料工程,2014,42(1):52-57. GENG B,ZHANG L,FAN N Q,et al.Effect of water vapor temperature and flow on oxidation behavior of T91 heat resisting steel[J].Journal of Materials Engineering,2014,42(1):52-57.
【13】高巍,金耀华,王正品,等.高温空气介质下T91钢氧化动力学研究[J].热加工工艺,2007,36(20):10-12. GAO W,JIN Y H,WANG Z P,et al.Research on oxidation kinetics of T91 steel under high-temperature air medium[J].Hot Working Technology,2007,36(20):10-12.
【14】郭丹,张维科,彭章华,等.马氏体钢T91和奥氏体钢TP347H管材高温蒸汽氧化层特性研究[J].腐蚀科学与防护技术,2019,31(6):609-614. GUO D,ZHANG W K,PENG Z H,et al.Characteristics of oxide scales formed on T91 martensite steel and TP347H austenite steel in high temperature steam[J].Corrosion Science and Protection Technology,2019,31(6):609-614.
【15】赵彦芬,周江,赵林松,等.TP304H/SA213T22异种钢焊口的状态检测与寿命评估[J].热力发电,2005,34(10):72-75. ZHAO Y F,ZHOU J,ZHAO L S,et al.Status inspection and service life assessment of welded joints betweed TP304H/SA213T22 steels of different sort[J].Thermal Power Generation,2005,34(10):72-75.
【16】VIITALA H,GALFI I,TASKINEN P.Initial oxidation behaviour of niobium stabilized TP347H austenitic stainless steel-Effect of grain size and temperature[J].Materials and Corrosion,2015,66(9):851-862.
【17】王玮,杨钢,赵吉庆,等.晶粒尺寸对Cr-Ni奥氏体不锈钢在硝酸中晶间腐蚀敏感性的影响[J].钢铁研究学报,2010,22(1):18-21. WANG W,YANG G,ZHAO J Q,et al.Influence of grain size on susceptibility of Cr-Ni austenitic stainless steel to intergranular attack in nitric acid[J].Journal of Iron and Steel Research,2010,22(1):18-21.
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